Variation in leaf-litter N and P concentrations as well as in N:P ratio with mean annual temperature (MAT) for all data combined (A, B, C), shrubs (D, E, F), evergreen broadleaf trees (G, H, I), deciduous broadleaf trees (J, K, L) and coniferous trees (M, N, O) (corresponding regression equations are given in Tab. S3-1 in Appendix S3).